Question

A 60 kg woman stands up in a 120 kg canoe of length 5 m. She walked 3 m on the canoe. Ignoring water resistance, find the displacement of canoe.

• A. -1 m
• B. - 1.5 m
• C. -2 m
• D. none of these

Answer 1

The correct option is A -1 m

Total displacement of woman w.rt to canoe is 3

Let the displacement of canoe is x , so the displacement of woman is 3-x

Since there is no external force , the CM of system will not change

So $120x=60(3-x)$

$x=1m$ opposite to direction of woman displacement .